2. Does the type of prenatal care affect a baby's birth weight? Researchers compared the birth weight of babies following four different types of prenatal care: no prenatal care at all, over-the counter- prenatal vitamins, prescribed prenatal vitamins with irregular doctor visits, prescribed prenatal vitamins with regular doctor visits. At the 5% significance level, what conclusions can be reached? No Prenatal Care 5.9 5.8 6.2 5.6 5.7 Over-the-Counter 6.0 6.1 6.1 Vitamins Only Irregular Doctor 7.0 6.8 Visits Regular Doctor N Visits